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Antenna design for ULF- Low-level magnetic measurements
Škoda, Martin ; Kříž, Tomáš (referee) ; Fiala, Pavel (advisor)
The present work deals with the design and study of the sensing element (antenna) for ultra low level measurements of low frequency magnetic fields. At the first, it considers the propagation of electromagnetic fields and form of propagation of electromagnetic waves. Then, using Ansys Maxwell are simulated by three models sensing elements. At the end of thesis, two antennas are implemented and conducted laboratory measurements with them.
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Investigation of lightning-generated elecromagnetic waves in a broad frequency range
Fišer, Jiří ; Santolík, Ondřej (advisor) ; Němec, František (referee)
In this work I present a study dedicated to the penetration of whistler- mode waves to the ionosphere. An algorithm of automatic detection of whist- lers in spectrograms computed from the data measured on the DEMETER sa- tellite is described. A method of causative lightning detected by the EUCLID lightning detection network assignment to a detected whistlers is described. Results of statistical study dedicated to relationship between the detected whistlers and assigned causative lightning. Based on the proccessing of data from 364 passes of the DEMETER satellite over monitored area is shown, that mean whistler amplitude decreases with distance between the causative lightning, increses with causative lightning current and in the evening is ap- proximately three times higher than in the morning. A study dedicated to subprotonospheric whistlers is presented. We found, that subprotonospheric whistler causative lightnings currents are very high compared to that of usual 0+ whistlers.
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Antenna design for ULF- Low-level magnetic measurements
Škoda, Martin ; Kříž, Tomáš (referee) ; Fiala, Pavel (advisor)
The present work deals with the design and study of the sensing element (antenna) for ultra low level measurements of low frequency magnetic fields. At the first, it considers the propagation of electromagnetic fields and form of propagation of electromagnetic waves. Then, using Ansys Maxwell are simulated by three models sensing elements. At the end of thesis, two antennas are implemented and conducted laboratory measurements with them.
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Geomagnetická aktivita a její vliv na ionosféru
Mošna, Zbyšek ; Koucká Knížová, Petra
Cl anek se zab yv a vazbou geomagnetick e aktivity na ionosf eru. Je pops an mechanismus pusoben poru sen eho meziplanetarního pole slune cn ho v etru na zemsk e magnetick e pole v r uzn ych oblastech (vysok e a n zk e s rky). V praktick e c asti jsou prezentov any v ysledky m e ren z vertik aln ho ionosf erick eho sondov an v obdob geomagneticky poru sen e situace z oblasti st redn ch s rek ze stanice Pr uhonice. Je uk az an pokles maxim aln elektronov e koncentrace a zm ena v y sek vrstvy F2.
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